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Front. Inform. Technol. Electron. Eng.  2010, Vol. 11 Issue (10): 798-807    DOI: 10.1631/jzus.C0910735
    
A novel differential multiuser detection algorithm for multiuser MIMO-OFDM systems
Zheng-min Kong*,1,2, Guang-xi Zhu1,2, Qiao-ling Tong3, Yan-chun Li1,2
1 Department of Electronics and Information Engineering, Huazhong University of Science and Technology 2 Wuhan 430074, China, Wuhan National Lab for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China 3 Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract  We propose an efficient low bit error rate (BER) and low complexity multiple-input multiple-output (MIMO) multiuser detection (MUD) method for use with multiuser MIMO orthogonal frequency division multiplexing (OFDM) systems. It is a hybrid method combining a multiuser-interference-cancellation-based decision feedback equalizer using error feedback filter (MIMO MIC DFE-EFF) and a differential algorithm. The proposed method, termed ‘MIMO MIC DFE-EFF with a differential algorithm’ for short, has a multiuser feedback structure. We describe the schemes of MIMO MIC DFE-EFF and MIMO MIC DFE-EFF with a differential algorithm, and compare their minimum mean square error (MMSE) performance and computational complexity. Simulation results show that a significant performance gain can be achieved by employing the MIMO MIC DFE-EFF detection algorithm in the context of a multiuser MIMO-OFDM system over frequency selective Rayleigh channel. MIMO MIC DFE-EFF with the differential algorithm improves both computational efficiency and BER performance in a multistage structure relative to conventional DFE-EFF, though there is a small reduction in system performance compared with MIMO MIC DFE-EFF without the differential algorithm.

Key words： Multiuser detection (MUD)      Orthogonal frequency division multiplexing (OFDM)      Multiple-input multiple-output (MIMO)      Decision feedback equalizer (DFE)      Error feedback filter (EFF)      Differential algorithm     
Received: 01 December 2009      Published: 30 September 2010
CLC:  TN929.5  
Fund:  Project  supported  by  the  National  Science  and  Technology  Pillar Program (Nos. 2008BAH30B12 and 2008BAH30B09), the Important National  Science  and  Technology  Specific  Projects  (Nos.  2008ZX 03003-004,   2009ZX03003-008,   2009ZX03003-009,   and   2009ZX
03002-009), the National Natural Science Foundation of China (No. 60802009),  and  the  National  High-Tech  R  &  D  Program  (863)  of
China (Nos. 2008AA01Z204 and 2009AA01Z205)
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Zheng-min Kong
Guang-xi Zhu
Qiao-ling Tong
Yan-chun Li
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Zheng-min Kong, Guang-xi Zhu, Qiao-ling Tong, Yan-chun Li. A novel differential multiuser detection algorithm for multiuser MIMO-OFDM systems. Front. Inform. Technol. Electron. Eng., 2010, 11(10): 798-807.

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http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C0910735     OR     http://www.zjujournals.com/xueshu/fitee/Y2010/V11/I10/798


A novel differential multiuser detection algorithm for multiuser MIMO-OFDM systems

We propose an efficient low bit error rate (BER) and low complexity multiple-input multiple-output (MIMO) multiuser detection (MUD) method for use with multiuser MIMO orthogonal frequency division multiplexing (OFDM) systems. It is a hybrid method combining a multiuser-interference-cancellation-based decision feedback equalizer using error feedback filter (MIMO MIC DFE-EFF) and a differential algorithm. The proposed method, termed ‘MIMO MIC DFE-EFF with a differential algorithm’ for short, has a multiuser feedback structure. We describe the schemes of MIMO MIC DFE-EFF and MIMO MIC DFE-EFF with a differential algorithm, and compare their minimum mean square error (MMSE) performance and computational complexity. Simulation results show that a significant performance gain can be achieved by employing the MIMO MIC DFE-EFF detection algorithm in the context of a multiuser MIMO-OFDM system over frequency selective Rayleigh channel. MIMO MIC DFE-EFF with the differential algorithm improves both computational efficiency and BER performance in a multistage structure relative to conventional DFE-EFF, though there is a small reduction in system performance compared with MIMO MIC DFE-EFF without the differential algorithm.

关键词： Multiuser detection (MUD),  Orthogonal frequency division multiplexing (OFDM),  Multiple-input multiple-output (MIMO),  Decision feedback equalizer (DFE),  Error feedback filter (EFF),  Differential algorithm 
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